We are now finally changing to C++11. New code and changes to existing code can take advantage of the new standard. Please do not go around and change old code to C++11 just because you can (unless there are specific reasons).

Note that this is only C++11. We won't make the jump to C++14 yet. C++14 support is not spread widely enough among Linux distributions (especially LTS versions) and we absolutely do not want to require people to install a new compiler for working on OpenMW.

I will update this post as we move along further the C++ standard path.

It removes a lot of unnecessary includes which cuts down on the time needed to parse/check by the compiler.
It replaces boost::* with std:: equivalents where available.

It does not replace boost::math::gcd because stupid msvc doesn't support it until 2017.3 P2.
Had to add a few extra #include <algorithm> because std::min/max because MSVC2013 requires it. MSVC2014 does not.

We do not touch boost's fpath because of Scrawl's concern about utf-8 paths. This has yet to be validated. This would be a big win for us if we could use std:: instead. This will be for another PR.